Motor-driven hand tool for making wrapped wire connections



Aug. 18, 1953 R. F. MALLINA 2,649,122

MOTOR-DRIVEN HAND TOOL FOR MAKING WRAPPED WIRE CONNECTIONS Filed March19, 1948 wwrlv TO/P R. F MA LL INA 3 @kiQ/XM ATTORNE V Patented Aug. 18,1953 UNITED STATES TENT OFFICE MOTOR-DRIVEN HAND TOOL FOR MAKING WRAPPEDWIRE CONNECTIONS New York Application March 19, 1948, Serial No. 15,838

Claims.

This invention relates to wiring tools and more specifically to a toolfor effecting solderless connections between connecting wires andterminals, for, example, of the type used in electrical apparatus.

The object of the present invention is the provision of a wiring tool ofthe type above-mentioned by which a wire is wound or wrapped on aterminal to effect an electrical connection therebetween withoutrequiring the soldering of the joint for efiicient electricalconductivity between the wire and the terminal.

A feature of the invention is the provision of two motors, oneelectrical and the other in the form of a clock spring for rotating awire winding spindle in opposite directions, in one direction bytheoperation of the electric motor for tensioning the motor spring andin the opposite direction by the tension of the motor spring forrotating the spindle which winds the wire around the terminal.

Another novel feature of the invention is the provision of a frictionclutch mechanism for preventing the stalling of the electric motorfollowing the tensioning of the motor spring preparatory to theoperation of the winding spindle by the motor spring.

Another novel feature is the provision of a speed gear reductionmechanism operatively connecting the clutch device to a shaft coupled tothe motor spring for tensioning the latter upon the operation of theelectric motor, a gear in the speed reduction mechanism having meanscooperating with means carried by a frame for the tool for arresting themovement of the gear mechanism both during the tensioning cycle of themotor spring by the electric motor and at the end of the winding of thewire on the terminal by the tension of the motor spring.

Another novel feature is the provision of manually operable means fordisengaging the friction clutch device for permitting the movement ofthe winding spindle by the operation of the motor spring.

Another novel feature is the provision of a centrifugal governoractuated by the tension of the motor spring for controlling theoperation of the wire twisting spindle during the winding operation ofthe wire on the terminal.

Other novel features and advantages of the invention will appear fromthe following description and by the claims appended thereto referencebeing bad to the accompanying drawing, in which:

Fig. 1 is a side assembly view;

Fig. 2 is a front view shown with a number of operating parts withportions broken away;

- Fig. is a vertical cross-sectional view taken on line 33 of Fig. 1;and

Fig. 4 is a vertical cross-sectional view taken on line AA of Fig. 1.

In accordance with the construction of the wiring tool of thisinvention, a mounting for the mechanism is formed with a handle l0having on each of its opposite sides a flange portion II, servingas abase for receiving an electric motor I? which is secured to the flangeportions II as by a plurality of screws I3. The mounting is also formedwith a projection in the form of a rib I4 having upright supports l5, I6and I1. Upright i5 terminates with an enlarged portion 13 for receivinga sleeve 27 cooperating with a bearing E9 in upright ii for rotatablysupporting a spindle 28 the function of which will be hereinafterdescribed in detail. 1

On the armature shaft of motor [2 is keyed a friction clutch element 24disposed in engageable relation with a complement clutch element 22formed with a collar Y and a pinion 25. The unit thus constructed ismounted for free movement on a shaft 23 journaled at one end in abearing 24 in upright l5 and its opposite end in a bore in the armatureshaft of motor [2 as best seen in Fig. 1. Pinion 25 meshes with a gear26 keyed on spindle 20 for rotating the latter and a pinion Fig. 1.

28 keyed on this spindle upon the operation of motor I2. Pinion 28meshes with a gear 29 keyed on shaft 23 and on this shaft is attachedthe inner convolution of a clock spring 3|, the outerdisposedconvolution of which is hooked to a pin 32 laterally extending fromupright IS. A pin 33 carried by the gear 29 cooperates with a projection34 laterally extending from upright l5 for holding the gear 29 andthereby the pinions 28 and therefore spindle 29 in normal startingposition against the normal tension of clock spring 3|.

A centrifugal speed governor in the form of two fly weights 35 and 36operated by shaft 23 frictionally engage the inner periphery of a drum31 secured to the upright l6 for controlling the speed of motor 12 whenwinding the spring 3|, in addition to controlling the speed of spindle20 when actuated by the tension of clock spring 3| which occurs upon themanual operation of a trigger member 38 pivoted at 39 in the projection14 as shown in Figs. 1, 2 and 4. This trigger member has a forked endportion 40 fitted in collar Y to move the clutch element 22 out ofengagement from clutch element 2| against the tension of a spring 4|coiled around a stud 45 to serve for holding the clutch elements 21 and22 normally in the engaged position as shown in The spindle at its frontdisposed end is provided at its periphery with a longitudinally disposedgroove or slot 42 for receiving the end of the wire to be wound around aterminal, not shown, inserted in a drilled hole 43 in the spindle 20 forwinding the wire therearound in a manner fully described in a copendingapplication in the name of Hickman-Mallina Reck Serial No. 753,066 filedJune 6, 1947, now Patent "No. 2,585,010.

A typical example of operation of this total in the winding or wrappingof a wire around a terminal for efiecting a solderless connectiontherebetween is as follows: Considering the operating parts in theposition shown in Fig. 1, that is, the friction clutch elements 2|22engaged by the tension of spring A! and the stop pins 33--34 abuttingagainst each other by the normal tension of clock spring 3|, theoperation of motor i2 is effective to rotate the pinion mounted for freerotation on shaft 23 and thereby the spindle 20 through gear 26, thepinion 28 keyed on this shaft and gear 29 in engagement with pinion 28thus rotating shaft 23 carrying the fly weights 35 of the governor.Rotation of shaft 23 is effective to tension the clock spring 3! to apoint wherein the pin 33 engages the opposite side of stop pin 34 fromthe position shown in Fig. 1. The-terminal and wire are then insertedinto the spindle. The trigger 3G is manually operated for releasing theclutch elements 2 l-22 so as to permit the rotation of shaft 23 and thatof spindle 20 in the opposite direction under control of governor 35-35for winding the wire around the terminal until the pin 33 carried bygear 2% reengages the stop pin 34 carried by upright 15. The terminal isthen removed from the spindle and the tool is now ready for another wirewinding operation, upon the release of trigger member the consequentreengagement of clutch elements A 2l22 under the tension of retractilespring a! and the resulting rewinding of spring 33.

During the tensioning of clock spring St the fly weights 35 and 35 ofthe governor do not offer an appreciable restraining torque to theoperation of the motor because of the gear reduction from pinion 28 togear 29, but the fiy weights effectively control the operation ofspindle 2%) when rotated under tension of the clock spring 3! which thusserves as a motor for driving the spindle.

What is claimed is:

1. A wiring tool for wrapping a wire on a terminal, said tool comprisingan electric motor, a wrapping spindle, a motor spring, a rotatable shaftconnected to the motor spring, a gear mech anism operatively connectingsaid spindle to' said electric motor, another gear mechanism operativelyconnecting said spindle to said shaft for tensioning said motor springupon the ope-ration of said electric motor, and a clutch mechanismmanually operable for disconnecting the first= mentioned gear mechanismfrom said electric motor to allow the operation of said spindle by saidmotor spring by way of the last-mentioned gear mechanism for wrappingthe wire on the terminal.

2. A wiring tool for effecting a wrapped electrical connection between awire and a terminal, said tool comprising a motor, a first clutchelement on the armature shaft of said motor,- a shaft disposed incoaxial relation to said armature shaft, a complementary clutch elementmounte'dfor' free rotation on said shaft and normally engaged to saidfirst clutch element, said 4 clutch element having a collar portion anda pinion secured thereto, a spindle shaft mounted parallel to saidshaft, a first gea-ron said spindle shaft mating with said pinionforming a first gear mechanism, a second pinion on said spindle sh-aft,a gear on said shaft mating with said second pinion forming a secondgear mechanism operativel'y connecting said shaft and said spindleshaft, a meter spring on said shaft between said gear on said shaft andthe first mentioned pinion, said motor spring being tensioned by saidmotor through said'two gear mechanisms and through said spindle shaftwhen said clutch elements are normail-y engaged, a wire winding spindlecarried by said spindle shaft, and manually operable means connected tosaid collar portion for disengaging said normally engaged clutchelements, whereby said motor spring rotates said spindle through saidsecond gear mechanism to wrap the connection.

3. A wiring tool for effecting a wrapped 'electrical connection betweena wire and a terminal in accordance with claim 2, wherein said toolcomprises also three uprights, the first of said uprights supporting theone end of said shaft and one end of said spindle shaft, said firstupright having a projection thereon, a pin on said gear on said shaftmating with said projection to limit the motion of said shaft in eitherdirection, the second of said uprights being adjacent said motor springand between said motor spring and said pinion, one end of said motorspring being secured to said second upright, the other end of said motorspring being secured to said shaft, said shaft passing through saidsecond upright and being supported thereby, and said third uprightsupporting the other end of said spindle shaft.

4. A wire wrapping tool comprising aframe, an electric motor and aspring motor mounted on the frame, a gear train interconnecting themotors through a normally engaged clutch for winding up the springmotor, a pin on an el'e' ment of the gear train and a stop on the framefor limiting the wind up and thus the'energy stored by the spring, awire wrapping spindle connected to the spring motor through a portion ofthe gear train, and manually operable means for disengaging the clutchto allow the spring motor to drive the spindle for a limited number ofturns as determined by the pin and stop to perform a wire wrappingoperation.

5. A wire wrapping tool comprising a frame, a motor, and energy storagemeans, a gear train interconnecting the motor and the storage meansthrough a normally engaged clutch for biasing the storage means to anenergy storing condition, pin and stop means mounted respectively on anelement of the gear train and on the frame, for limiting the energystored in the storage means, a wire wrapping spindle including a-wirereceiving slot adjacent to its outer extremity. the spindle beingconnected to the energy storage means through a portion of the geartrain in-'&

to the frame, and means for optionally disengaging the clutch to allowthe energy storage means to supply power to the spindle for a-wire.

wrapping operation.

RUDGLPH F. minim,

(References sn'fnlowing page) References Cited in the tile of thispatent UNITED STATES PATENTS Number Name Date Wortman Oct. 27, 1891Langer Sept. 17, 1907 Jenney Apr. 2, 1912 Taliaferro Mar. 7, 1916 SchoolAug. 28, 1917 Bush Dec. 11, 1917 Kocourek May 14, 1918 Jones June 4,1918 Wenzelmann Oct. 29, 1918 Number 6 Name Date Piersen Nov, 16, 1920Jones Feb. 14, 1922 Tydings Aug. 26, 1924 Squibb Aug. 11, 1925 Smith May4, 1926 De Bold Nov. 6, 1926 Babcock July 5, 1927 Schneider July 5, 1927Foulder Aug. 21, 1928 Wright May 14, 1929 Von Kramer June 19, 1945 BeardOct. 2, 1945

